add trafaret_config in requirements

[inzem77]

Long story short

python ./main.py
Traceback (most recent call last):
File "./main.py", line 8, in
from trafaret_config import commandline
ModuleNotFoundError: No module named 'trafaret_config

Expected behaviour

Actual behaviour

Error

Steps to reproduce

Your environment

aiohttp-jinja2==0.13.0
-e [email protected]:KeepSafe/aiohttp.git@d93c2b1#egg=aiohttpdemo_chat&subdirectory=demos/chat
async-timeout==1.1.0
chardet==2.3.0
Jinja2==2.9.4
MarkupSafe==0.23
multidict==2.1.4
PyYAML==3.12
trafaret==0.7.5
trafaret-config==1.0.1
yarl==0.8.1

Target config i have installed from https://github.com/tailhook/trafaret-config

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